Let your AI agent find your customers with GrowFast

Short answer:add GrowFast's remote MCP server to ChatGPT, Claude, Cursor, Gemini CLI or VS Code, approve the consent screen once, and tell the agent to scan your product's domain. It returns the ideal customer profile, matching companies scored 1-10 and draft first emails. You review and approve; on the ChatGPT and Claude connectors nothing is sent. You need a GrowFast account (sign up) and your plan's limits apply to every call.

Server addresses

• https://growfast.sh/api/mcp/chatgpt: ChatGPT. Five research and drafting tools, OAuth.
• https://growfast.sh/api/mcp/claude: Claude and Claude Code. The same five tools, OAuth.
• https://growfast.sh/api/mcp: the full server (Cursor, Gemini CLI, any MCP client). OAuth or an API key.

Transport is streamable HTTP. It is also published in the Official MCP Registry as sh.growfast/growfast.

Tools

The ChatGPT and Claude connectors expose these five. Nothing there sends an email or posts to Reddit.

• scan_domain: Read a product's website and return its ideal customer profile, a first cold email and the best-fit companies scored 1-10.
• list_reddit_monitors: The Reddit monitors on the account, one per product.
• set_reddit_monitor: Set what to listen for on Reddit for one product.
• list_reddit_matches: Reddit posts found for a product, best first, with drafted replies.
• draft_outreach_emails: For up to 10 companies find the named decision-maker on each company's own site and write a first email to them.

The full server at /api/mcp adds the account tools. Two of them, send_reply and set_autopilot, send real email.

• import_leads: Clean your own list (CSV text with an email column, optional company, name, website) into leads: drops invalid, duplicate, already-emailed, public-sector, role-mailbox (info@, support@) and no-mail-server addresses, and says why.
• get_email_allowance: How many outreach emails are left this month on the plan.
• export_outreach: Everyone this account has emailed, as CSV: email, company, contact, product, subject, delivery, replied, reply category.
• list_sending_domains: The account's sending domains and managed GrowFast address, with remaining sends today.
• list_autopilots: Every autopilot on the account (one per product) with its last result.
• set_autopilot: Create or change the autopilot for one product and turn it on or off.
• send_reply: Send the founder's answer to a prospect who replied, in the same thread, from the address they wrote to.

Sign-in

ChatGPT, Claude and Gemini CLI sign you in with OAuth 2.1 (PKCE, dynamic client registration): a browser window opens, you sign in to GrowFast and click Allow. There is no key to paste. Cursor's redirect address is not accepted by the OAuth flow, so in Cursor, or for scripts, create an API key under Settings > API keys and send it as Authorization: Bearer sk_live_…. Revoke a key there at any time.

Connect in 60 seconds

What you see when you approve: GrowFast asks you to sign in, then shows a consent screen titled "Connect <app> to GrowFast?" naming the app, listing what it can do on your account and offering Allow or Cancel. Allowing creates an API key named "MCP: <app>" that expires in 90days; revoke it any time under Settings > API keys. The ChatGPT and Claude consent screens say the app cannot send emails or post to Reddit.

ChatGPT

1. Turn on developer mode in ChatGPT's settings and add a custom MCP connector.
2. Use the server address https://growfast.sh/api/mcp/chatgpt and choose OAuth.
3. Sign in to GrowFast, click Allow, then paste a prompt from the library below.

ChatGPT's menu names change; we have not re-checked these steps against the current ChatGPT interface. The server address and OAuth flow are what matter.

Claude

1. In Claude, add a custom connector with https://growfast.sh/api/mcp/claude.
2. Sign in to GrowFast and click Allow.

Claude Code

/plugin marketplace add airdropfi/growfast-claude-plugin
/plugin install growfast@growfast-plugins
/reload-plugins

Then open /mcp, choose growfast and Authenticate. Or, without the plugin:

claude mcp add --transport http growfast https://growfast.sh/api/mcp/claude

Gemini CLI

gemini extensions install https://github.com/airdropfi/growfast-gemini-extension
# restart Gemini CLI, then sign in:
/mcp auth growfast

Cursor

Create an API key under Settings > API keys, export it as GROWFAST_API_KEY, then add this to .cursor/mcp.json and restart Cursor:

{
  "mcpServers": {
    "growfast": {
      "url": "https://growfast.sh/api/mcp",
      "headers": { "Authorization": "Bearer ${env:GROWFAST_API_KEY}" }
    }
  }
}

This key reaches every tool, including the two that send email. Keep Cursor's tool-call approval on. The Cursor kit adds a rule and two skills.

VS Code (GitHub Copilot) and other clients that take a URL

Same API key. VS Code reads .vscode/mcp.json; the format below follows its documented schema and we have not run it in VS Code ourselves. Other clients (Windsurf, Cline and similar) take the same URL and Authorization header under their own key names: check your client's MCP settings for whether it wants url or serverUrl.

{
  "inputs": [
    { "type": "promptString", "id": "growfast-key", "description": "GrowFast API key", "password": true }
  ],
  "servers": {
    "growfast": {
      "type": "http",
      "url": "https://growfast.sh/api/mcp",
      "headers": { "Authorization": "Bearer ${input:growfast-key}" }
    }
  }
}

Prompt library

You tag the work and review the result. Each prompt names tools that exist; the ones marked "full server" need the API key connection (Cursor, VS Code, Gemini CLI), not the ChatGPT or Claude connectors.

Agents and human oversight

The agent quickstart (discovery, auth, call sequence, quotas, error codes, hand-off) and what the owner can see, approve and revoke are on /agents.

What it does not do

• scan_domain saves the scan to your account, and set_reddit_monitor replaces that product's earlier monitor settings. Both are real changes.
• Drafts are starting points. Read and edit them before you send, and read a Reddit thread and its subreddit's rules before you post.
• No result is promised: GrowFast does not promise a number of leads, replies or meetings.

Data and privacy

The server receives what the tools need: the domains, product details, company lists and keywords you ask your assistant to send, and the data on your GrowFast account. The plugins and extensions store nothing and run no code on your machine. Read the privacy policy and terms.

Source and listings

• Claude Code plugin
• Gemini CLI extension
• Cursor kit
• Official MCP Registry: sh.growfast/growfast
• Machine-readable: server card, llms.txt, pricing.md
• REST API and OpenAPI: API docs, openapi.json

Questions